Carl hugo weise



(No Model.)

C. H. WEISS. UPAGTURING PLATES PoR SECONDARY PROCESS 0E MAN BATTERIES.

Patented Nov. 3,1896.

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UNITED STATES PATENT -OFFICE,

CARL HUGO wEIsE, or PssNEoK, GERMANY.

PROCESS OF MANUFACTURING PLATES FOR SECONDARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 570,619, dated November3, 1896.

Application led April 4,1895l Serial No. 544,437. (No specimens.)VPatented in France October 10, 1894, No. 241,977 j in` Hungary March 4,1895,1To. 2,814; in Belgium June 22,1895, No. 116,220; in SwitzerlandJune 24, 1895, No. 10,619; in Spainl'une 26, 1895, No.17,645; in EnglandJune 27.1895, No. 12,420; in Portugal July 10, 1895, No. 2,031, and

in Italy October 2,1895, No. 39,878/163.

No. 116,220, dated June 22, 1895; in Italy, No.

39,878/163, dated October 2, 1895; in Spain, No. 17,645, dated June 26,1895; in Portugal, No. 2,031, dated July 10, 1895, and in Switzerland,No.10,619,dated June 24, 1895,) of which the following is aspecification.

The object of the present invention is a process for the production ofaccumulatorplates which differs from the processes heretofore known inthat the plates are produced directly by the introduction betweencompressing-plates of a pasty mass of some suitable lead compound,which, having been rst subjected to the chemical action of an electricalcurrent for the purpose of hardening the surface, are then subjected toa further hardening by the compressing-plates, which prevent anextension of the accumulatorplates in their further formation. Theprocess is executed in a frame shown in the annexed drawings,which isclosed by perforated compressing-plates.

In the drawings, Figure 1 is a detail view representing a cross-sectionof the frame. Fig. 2 is a detail sectional view representing the framewith the compressing-plates fastened by bending over the flaps oriianges. Fig. 8 represents one of the compressing-plates in frontelevation. Fig. 4is an edge elevation of the same. Fig. 5 is a detailsectional view representing part of a complete electrode.

The process is executed in thevfollowing manner: The lead or lead-alloyframe b,which is preferably formed with a concave inner face andoppositely-extending flaps or iianges, is covered with a thin lead-foild or a sheet of an easily-perforated material and laid over inhorizontal position, when a perforated compressing-plate a is placed ontop of the leadfoil inside ange c and fastened to the frame by bendingover the iiap or flange. Into the trough thus formed by turning theframe over with plate ct down a pasty mass of lead salts 5 5 m,preferably lead oxid, is now introduced and covered with a secondlead-foil cl and a second perforated compression-plate a,which ispressed down upon the pasty mass and secured in place by bending overthe flange c 6o on the opposite side of the frame for the purpose ofcompletely inclosing the lead salts in the same. The completely-inclosedmass m is now perforated With cellulose threads l, which are introducedthrough the perforations e of the compressing-plates a in ,any suitablemanner, such as the use of a needle, and form holes corresponding to thesize of the thread in the lead-foil, the ,leaking out of the pasty massbeing prevented by the presence 7o of the threads. In this manner theinclosed mass is prevented from running together,

at the same time making it possible to introduce the electrolyticalfluid. These frames or boxes are now placed in a bath of dilutedsulfuric acid, and an electric current passed through the sameimmediately. This operation causes an immediate hardening p of thesurface of the mass by reason of the chemical change of its surface,preventing 8 the mass from dissolving in the electrolytical bath. Theinner parts of the mass are then slowly formed under the further actionof the current. to extend or expand during this forming acv tion, whichtendency is counteracted by the pressure or conning action of the platesa on the inclosed mass, the result of which is that the latter obtainsan extraordinary hardness, by which their time of life is considerablyin- 9o creased. At the same time the formed plates, in consequence oftheir expansion, are pressed strongly against the lead frame, whichserves at the same time as conductor for the current, creating thereby agood conductor. After n- 9 5 ishing the process the plates are takenfrom the bath and dried in the air.. The cellulose threads passingthrough the plates are chemically changed and weakened by the action ofthe acid, and when they are exposed tothe roo The mass has a tendencyair they fall to pieces and are completely destroyed, leaving in thisway channels passing through the plates, which in the practical use ofthe plates offer the essential advantage while charging that thecirculation of the gas bubbles arising takes place in these channels,which greatly assists the charging operation, as a much less quantity ofbubbles will arise on the surface than heretofore customary, thusproducing an economy in the charging operation. At the same time areduction of the interior resistance is eifected by the increase of theeective surface, caused by the formation of channels.

The formation of positive and negative plates being accomplished atdifferent operations, it is very essential that each electrode beremoved as soon as it is formed, and a new electrode, not yet formed, beintroduced in its place. This is not the case in the processes usedheretofore.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

l. The herein-described method of forming accumulator-plates, whichconsists in confining a pasty mass of lead compound in an acidproofframe or vessel having perforated sides, passing cellulose threadsthrough the perforations of the frame, placing thesaine in an acidbath,passing an electric current through the same, and finally exposing theformed hardened plate to the action of the air to destroy thechemically-changed cellulose, as and for the purpose set forth.

2. The herein-described process of forming accumulator-plates,whichconsists in lining a perforated frame or receptacle with lead-foil orequivalent material, placing and confining a pasty mass of lead compoundtherein, passing cellulose threads throughV the perforations, foil andmass, subjecting the same to the action of an electric current in anacidbath, and finally exposing to the air to destroy thechemically-changed cellulose, as set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

CARL HUGO WEISE.

Vitnesses: v

WILHELM ScHwIcTHAL, J oHN B. JACKSON.

